Mathematics, 14.02.2022 01:00 tasnimsas3
A theater has 22 rows of seats. The first row has 18 seats, the second row has 20 seats, the third row has 22 seats, and so on. How many seats are in the theater?
Answers: 3
![S_{n}= \frac{n}{2}\bigg[2a+(n-1)d\bigg]](/tpl/images/2658/2906/8f3cb.png)
![\implies S_{22}= \frac{22}{2}\bigg[2(28)+(22-1)(2)\bigg]](/tpl/images/2658/2906/68059.png)
![\implies S_{22}=11[56+(21)(2)]](/tpl/images/2658/2906/08ffd.png)
![\implies S_{22}=11[56+42]](/tpl/images/2658/2906/d02ed.png)
![\implies S_{22}=11[98]](/tpl/images/2658/2906/5288e.png)
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A theater has 22 rows of seats. The first row has 18 seats, the second row has 20 seats, the third r...
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